Programming the statistical procedures from SAS

Periodogram ,Proc spectra- basic understanding of output

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Periodogram ,Proc spectra- basic understanding of output

Hi,
I run proc spectra on a daily data set, of 5 years.
I'm trying to find the cycles in the data.
what does each of the plot show?
periodogram *period
spectral density*period
?
how would an anual cycle look? a "pik" at period=365?
Thanks,
Tal
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